1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/list.h>
7 #include <linux/slab.h>
8 #include <linux/rwsem.h>
9 #include <linux/xarray.h>
10
11 #include "ksmbd_ida.h"
12 #include "user_session.h"
13 #include "user_config.h"
14 #include "tree_connect.h"
15 #include "../transport_ipc.h"
16 #include "../connection.h"
17 #include "../vfs_cache.h"
18
19 static DEFINE_IDA(session_ida);
20
21 #define SESSION_HASH_BITS 3
22 static DEFINE_HASHTABLE(sessions_table, SESSION_HASH_BITS);
23 static DECLARE_RWSEM(sessions_table_lock);
24
25 struct ksmbd_session_rpc {
26 int id;
27 unsigned int method;
28 };
29
free_channel_list(struct ksmbd_session * sess)30 static void free_channel_list(struct ksmbd_session *sess)
31 {
32 struct channel *chann;
33 unsigned long index;
34
35 xa_for_each(&sess->ksmbd_chann_list, index, chann) {
36 xa_erase(&sess->ksmbd_chann_list, index);
37 kfree(chann);
38 }
39
40 xa_destroy(&sess->ksmbd_chann_list);
41 }
42
__session_rpc_close(struct ksmbd_session * sess,struct ksmbd_session_rpc * entry)43 static void __session_rpc_close(struct ksmbd_session *sess,
44 struct ksmbd_session_rpc *entry)
45 {
46 struct ksmbd_rpc_command *resp;
47
48 resp = ksmbd_rpc_close(sess, entry->id);
49 if (!resp)
50 pr_err("Unable to close RPC pipe %d\n", entry->id);
51
52 kvfree(resp);
53 ksmbd_rpc_id_free(entry->id);
54 kfree(entry);
55 }
56
ksmbd_session_rpc_clear_list(struct ksmbd_session * sess)57 static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess)
58 {
59 struct ksmbd_session_rpc *entry;
60 long index;
61
62 xa_for_each(&sess->rpc_handle_list, index, entry) {
63 xa_erase(&sess->rpc_handle_list, index);
64 __session_rpc_close(sess, entry);
65 }
66
67 xa_destroy(&sess->rpc_handle_list);
68 }
69
__rpc_method(char * rpc_name)70 static int __rpc_method(char *rpc_name)
71 {
72 if (!strcmp(rpc_name, "\\srvsvc") || !strcmp(rpc_name, "srvsvc"))
73 return KSMBD_RPC_SRVSVC_METHOD_INVOKE;
74
75 if (!strcmp(rpc_name, "\\wkssvc") || !strcmp(rpc_name, "wkssvc"))
76 return KSMBD_RPC_WKSSVC_METHOD_INVOKE;
77
78 if (!strcmp(rpc_name, "LANMAN") || !strcmp(rpc_name, "lanman"))
79 return KSMBD_RPC_RAP_METHOD;
80
81 if (!strcmp(rpc_name, "\\samr") || !strcmp(rpc_name, "samr"))
82 return KSMBD_RPC_SAMR_METHOD_INVOKE;
83
84 if (!strcmp(rpc_name, "\\lsarpc") || !strcmp(rpc_name, "lsarpc"))
85 return KSMBD_RPC_LSARPC_METHOD_INVOKE;
86
87 pr_err("Unsupported RPC: %s\n", rpc_name);
88 return 0;
89 }
90
ksmbd_session_rpc_open(struct ksmbd_session * sess,char * rpc_name)91 int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name)
92 {
93 struct ksmbd_session_rpc *entry;
94 struct ksmbd_rpc_command *resp;
95 int method;
96
97 method = __rpc_method(rpc_name);
98 if (!method)
99 return -EINVAL;
100
101 entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL);
102 if (!entry)
103 return -ENOMEM;
104
105 entry->method = method;
106 entry->id = ksmbd_ipc_id_alloc();
107 if (entry->id < 0)
108 goto free_entry;
109 xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);
110
111 resp = ksmbd_rpc_open(sess, entry->id);
112 if (!resp)
113 goto free_id;
114
115 kvfree(resp);
116 return entry->id;
117 free_id:
118 xa_erase(&sess->rpc_handle_list, entry->id);
119 ksmbd_rpc_id_free(entry->id);
120 free_entry:
121 kfree(entry);
122 return -EINVAL;
123 }
124
ksmbd_session_rpc_close(struct ksmbd_session * sess,int id)125 void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id)
126 {
127 struct ksmbd_session_rpc *entry;
128
129 entry = xa_erase(&sess->rpc_handle_list, id);
130 if (entry)
131 __session_rpc_close(sess, entry);
132 }
133
ksmbd_session_rpc_method(struct ksmbd_session * sess,int id)134 int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id)
135 {
136 struct ksmbd_session_rpc *entry;
137
138 entry = xa_load(&sess->rpc_handle_list, id);
139 return entry ? entry->method : 0;
140 }
141
ksmbd_session_destroy(struct ksmbd_session * sess)142 void ksmbd_session_destroy(struct ksmbd_session *sess)
143 {
144 if (!sess)
145 return;
146
147 if (sess->user)
148 ksmbd_free_user(sess->user);
149
150 ksmbd_tree_conn_session_logoff(sess);
151 ksmbd_destroy_file_table(&sess->file_table);
152 ksmbd_session_rpc_clear_list(sess);
153 free_channel_list(sess);
154 kfree(sess->Preauth_HashValue);
155 ksmbd_release_id(&session_ida, sess->id);
156 kfree(sess);
157 }
158
__session_lookup(unsigned long long id)159 static struct ksmbd_session *__session_lookup(unsigned long long id)
160 {
161 struct ksmbd_session *sess;
162
163 hash_for_each_possible(sessions_table, sess, hlist, id) {
164 if (id == sess->id) {
165 sess->last_active = jiffies;
166 return sess;
167 }
168 }
169 return NULL;
170 }
171
ksmbd_expire_session(struct ksmbd_conn * conn)172 static void ksmbd_expire_session(struct ksmbd_conn *conn)
173 {
174 unsigned long id;
175 struct ksmbd_session *sess;
176
177 down_write(&conn->session_lock);
178 xa_for_each(&conn->sessions, id, sess) {
179 if (sess->state != SMB2_SESSION_VALID ||
180 time_after(jiffies,
181 sess->last_active + SMB2_SESSION_TIMEOUT)) {
182 xa_erase(&conn->sessions, sess->id);
183 hash_del(&sess->hlist);
184 ksmbd_session_destroy(sess);
185 continue;
186 }
187 }
188 up_write(&conn->session_lock);
189 }
190
ksmbd_session_register(struct ksmbd_conn * conn,struct ksmbd_session * sess)191 int ksmbd_session_register(struct ksmbd_conn *conn,
192 struct ksmbd_session *sess)
193 {
194 sess->dialect = conn->dialect;
195 memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
196 ksmbd_expire_session(conn);
197 return xa_err(xa_store(&conn->sessions, sess->id, sess, GFP_KERNEL));
198 }
199
ksmbd_chann_del(struct ksmbd_conn * conn,struct ksmbd_session * sess)200 static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess)
201 {
202 struct channel *chann;
203
204 chann = xa_erase(&sess->ksmbd_chann_list, (long)conn);
205 if (!chann)
206 return -ENOENT;
207
208 kfree(chann);
209 return 0;
210 }
211
ksmbd_sessions_deregister(struct ksmbd_conn * conn)212 void ksmbd_sessions_deregister(struct ksmbd_conn *conn)
213 {
214 struct ksmbd_session *sess;
215 unsigned long id;
216
217 down_write(&sessions_table_lock);
218 if (conn->binding) {
219 int bkt;
220 struct hlist_node *tmp;
221
222 hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) {
223 if (!ksmbd_chann_del(conn, sess) &&
224 xa_empty(&sess->ksmbd_chann_list)) {
225 hash_del(&sess->hlist);
226 ksmbd_session_destroy(sess);
227 }
228 }
229 }
230 up_write(&sessions_table_lock);
231
232 down_write(&conn->session_lock);
233 xa_for_each(&conn->sessions, id, sess) {
234 unsigned long chann_id;
235 struct channel *chann;
236
237 xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) {
238 if (chann->conn != conn)
239 ksmbd_conn_set_exiting(chann->conn);
240 }
241
242 ksmbd_chann_del(conn, sess);
243 if (xa_empty(&sess->ksmbd_chann_list)) {
244 xa_erase(&conn->sessions, sess->id);
245 hash_del(&sess->hlist);
246 ksmbd_session_destroy(sess);
247 }
248 }
249 up_write(&conn->session_lock);
250 }
251
ksmbd_session_lookup(struct ksmbd_conn * conn,unsigned long long id)252 struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
253 unsigned long long id)
254 {
255 struct ksmbd_session *sess;
256
257 down_read(&conn->session_lock);
258 sess = xa_load(&conn->sessions, id);
259 if (sess)
260 sess->last_active = jiffies;
261 up_read(&conn->session_lock);
262 return sess;
263 }
264
ksmbd_session_lookup_slowpath(unsigned long long id)265 struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
266 {
267 struct ksmbd_session *sess;
268
269 down_read(&sessions_table_lock);
270 sess = __session_lookup(id);
271 if (sess)
272 sess->last_active = jiffies;
273 up_read(&sessions_table_lock);
274
275 return sess;
276 }
277
ksmbd_session_lookup_all(struct ksmbd_conn * conn,unsigned long long id)278 struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
279 unsigned long long id)
280 {
281 struct ksmbd_session *sess;
282
283 sess = ksmbd_session_lookup(conn, id);
284 if (!sess && conn->binding)
285 sess = ksmbd_session_lookup_slowpath(id);
286 if (sess && sess->state != SMB2_SESSION_VALID)
287 sess = NULL;
288 return sess;
289 }
290
ksmbd_preauth_session_alloc(struct ksmbd_conn * conn,u64 sess_id)291 struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
292 u64 sess_id)
293 {
294 struct preauth_session *sess;
295
296 sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL);
297 if (!sess)
298 return NULL;
299
300 sess->id = sess_id;
301 memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue,
302 PREAUTH_HASHVALUE_SIZE);
303 list_add(&sess->preauth_entry, &conn->preauth_sess_table);
304
305 return sess;
306 }
307
ksmbd_preauth_session_id_match(struct preauth_session * sess,unsigned long long id)308 static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
309 unsigned long long id)
310 {
311 return sess->id == id;
312 }
313
ksmbd_preauth_session_lookup(struct ksmbd_conn * conn,unsigned long long id)314 struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,
315 unsigned long long id)
316 {
317 struct preauth_session *sess = NULL;
318
319 list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) {
320 if (ksmbd_preauth_session_id_match(sess, id))
321 return sess;
322 }
323 return NULL;
324 }
325
__init_smb2_session(struct ksmbd_session * sess)326 static int __init_smb2_session(struct ksmbd_session *sess)
327 {
328 int id = ksmbd_acquire_smb2_uid(&session_ida);
329
330 if (id < 0)
331 return -EINVAL;
332 sess->id = id;
333 return 0;
334 }
335
__session_create(int protocol)336 static struct ksmbd_session *__session_create(int protocol)
337 {
338 struct ksmbd_session *sess;
339 int ret;
340
341 if (protocol != CIFDS_SESSION_FLAG_SMB2)
342 return NULL;
343
344 sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL);
345 if (!sess)
346 return NULL;
347
348 if (ksmbd_init_file_table(&sess->file_table))
349 goto error;
350
351 sess->last_active = jiffies;
352 sess->state = SMB2_SESSION_IN_PROGRESS;
353 set_session_flag(sess, protocol);
354 xa_init(&sess->tree_conns);
355 xa_init(&sess->ksmbd_chann_list);
356 xa_init(&sess->rpc_handle_list);
357 sess->sequence_number = 1;
358 rwlock_init(&sess->tree_conns_lock);
359
360 ret = __init_smb2_session(sess);
361 if (ret)
362 goto error;
363
364 ida_init(&sess->tree_conn_ida);
365
366 down_write(&sessions_table_lock);
367 hash_add(sessions_table, &sess->hlist, sess->id);
368 up_write(&sessions_table_lock);
369
370 return sess;
371
372 error:
373 ksmbd_session_destroy(sess);
374 return NULL;
375 }
376
ksmbd_smb2_session_create(void)377 struct ksmbd_session *ksmbd_smb2_session_create(void)
378 {
379 return __session_create(CIFDS_SESSION_FLAG_SMB2);
380 }
381
ksmbd_acquire_tree_conn_id(struct ksmbd_session * sess)382 int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess)
383 {
384 int id = -EINVAL;
385
386 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
387 id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida);
388
389 return id;
390 }
391
ksmbd_release_tree_conn_id(struct ksmbd_session * sess,int id)392 void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id)
393 {
394 if (id >= 0)
395 ksmbd_release_id(&sess->tree_conn_ida, id);
396 }
397